<template>
  <div class="goods_params">
    <!--面包屑导航-->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!--卡片区域-->
    <el-card>
      <!--警告-->
      <el-alert
              title="注意: 只允许为第三级分类设置相关参数! "
              type="warning"
              :closable="false" show-icon>
      </el-alert>
      <!--选择商品分类-->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类:</span>
          <!--选择商品分类的级联选择器-->
          <el-cascader
                  v-model="selectedCateKeys"
                  :options="cateList"
                  :props="cateProps"
                  @change="handleChange"></el-cascader>
        </el-col>
      </el-row>
      <!--tab 页签-->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!--添加动态参数的面板-->
        <el-tab-pane label="动态参数" name="many">
          <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加参数
          </el-button>
          <!--动态参数表格-->
          <el-table :data="manyTableData" border stripe>
            <!-- 展开列-->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <el-tag v-for="(item,index) in scope.row.attr_vals" :key="index"
                        closable @close="handleClose(index,scope.row)">
                  {{item}}
                </el-tag>
                <!--输入文本框-->
                <el-input
                        class="input-new-tag"
                        v-if="scope.row.inputVisible"
                        v-model="scope.row.inputValue"
                        ref="saveTagInput"
                        size="small"
                        @keyup.enter.native="handleInputConfirm(scope.row)"
                        @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <!-- 添加按钮-->
                <el-button class="button-new-tag" v-else size="small" @click="showInput(scope.row)">+ New Tag
                </el-button>
              </template>
            </el-table-column>
            <!-- 索引列-->
            <el-table-column type="index" label="#"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">
                  编辑
                </el-button>
                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除
                </el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!-- 添加静态属性的面板-->
        <el-tab-pane label="静态属性" name="only">
          <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加属性
          </el-button>
          <!--静态属性表格-->
          <el-table :data="onlyTaleData" border stripe>
            <!-- 展开列-->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <el-tag v-for="(item,index) in scope.row.attr_vals" :key="index"
                        closable @close="handleClose(index,scope.row)">
                  {{item}}
                </el-tag>
                <!--输入文本框-->
                <el-input
                        class="input-new-tag"
                        v-if="scope.row.inputVisible"
                        v-model="scope.row.inputValue"
                        ref="saveTagInput"
                        size="small"
                        @keyup.enter.native="handleInputConfirm(scope.row)"
                        @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <!-- 添加按钮-->
                <el-button class="button-new-tag" v-else size="small" @click="showInput(scope.row)">+ New Tag
                </el-button>
              </template>
            </el-table-column>
            <!-- 索引列-->
            <el-table-column type="index" label="#"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">
                  编辑
                </el-button>
                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除
                </el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>
    <!--    添加参数的对话框-->
    <el-dialog
            :title="'添加'+  titleText"
            :visible.sync="addDialogVisible"
            width="50%"
            @close="addDialogClose">
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>
    <!--  修改参数的对话框-->
    <el-dialog
            :title="'修改'+  titleText"
            :visible.sync="editDialogVisible"
            width="50%"
            @close="editDialogClose">
      <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
  export default {
    name: "Params",
    data() {
      return {
        // 商品分类列表
        cateList: [],
        cateProps: {
          value: 'cat_id',
          label: 'cat_name',
          expandTrigger: 'hover',
          children: 'children'
        },
        // 级联选择框双向绑定到的数组
        selectedCateKeys: [],
        // 被激活的页签的名称
        activeName: 'many',
        // 保存 动态参数的数据
        manyTableData: [],
        // 保存静态属性的数据
        onlyTaleData: [],
        // 控制添加对话框的显示与隐藏
        addDialogVisible: false,
        // 添加参数的表单数据对象
        addForm: {
          attr_name: ''
        },
        // 添加表单的验证对象
        addFormRules: {
          attr_name: [{
            required: true, message: "请输入参数名称", trigger: 'blur'
          }]
        },
        // 控制修改对话框的显示与隐藏
        editDialogVisible: false,
        // 修改表单的验证对象
        editFormRules: {
          attr_name: [{
            required: true, message: "请输入参数名称", trigger: 'blur'
          }]
        },
        // 修改参数的表单数据对象
        editForm: {
          attr_name: ''
        }
      }
    },
    created() {
      this.getCateList()
    },
    methods: {
      // 获取所有的商品分类列表
      async getCateList() {
        const {data: res} = await this.$http.get('categories')
        if (res.meta.status !== 200) return this.$message.error('获取商品分类失败!')
        this.cateList = res.data
      },
      // tab 页签点击事件处理函数
      handleTabClick() {
        this.getParams()
      },
      // 级联选择框选中项变化，会触发这个函数
      handleChange() {
        this.getParams()
      },
      async getParams() {
        if (this.selectedCateKeys.length !== 3) {
          this.selectedCateKeys = []
          this.manyTableData = []
          this.onlyTaleData = []
          return
        }
        // 根据所选分类的id，和当前所处的面板，获取对应的参数
        const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`, {params: {sel: this.activeName}})
        if (res.meta.status !== 200) {
          return this.$message.error('获取参数列表失败!')
        }

        res.data.forEach(item => {
          // 制按钮与文本框的切换显示
          item.inputVisible = false
          // 文本框输入的内容
          item.inputValue = ''
          item.attr_vals = item.attr_vals ? item.attr_vals.split(',') : []
        })
        if (this.activeName === 'many') {
          this.manyTableData = res.data
        } else {
          this.onlyTaleData = res.data
        }
      },
      // 监听对话框的关闭事件
      addDialogClose() {
        this.$refs.addFormRef.resetFields()
      },
      // 添加动态参数/静态属性
      addParams() {
        this.$refs.addFormRef.validate(async valid => {
          if (!valid) return
          const {data: res} = await this.$http.post(`categories/${this.cateId}/attributes`, {
            attr_name: this.addForm.attr_name,
            attr_sel: this.activeName
          })
          if (res.meta.status !== 201) {
            return this.$message.error('添加参数失败!')
          }
          this.$message.success('添加参数成功!')
          this.addDialogVisible = false
          this.getParams()
        })
      },
      // 展示修改对话框
      async showEditDialog(attr_id) {
        const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`)
        if (res.meta.status !== 200) return this.$message.error('获取参数信息失败!')
        this.editForm = res.data
        this.editDialogVisible = true
      },
      // 监听修改对话框的关闭事件 重置
      editDialogClose() {
        this.$refs.editFormRef.resetFields()
      },
      // 点击按钮，修改参数信息
      editParams() {
        this.$refs.editFormRef.validate(async valid => {
          if (!valid) return
          const {data: res} = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, {
            attr_name: this.editForm.attr_name,
            attr_sel: this.activeName
          })
          if (res.meta.status !== 200) return this.$message.error('修改参数信息失败!')
          this.$message.success('修改参数信息成功!')
          this.getParams()
          this.editDialogVisible = false
        })
      },
      // 根据id删除对应参数或属性
      async removeParams(attr_id) {
        const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).catch(err => err)
        // 用户取消了删除的操作
        if (confirmResult !== 'confirm') {
          return this.$message.info('已取消删除!')
        }

        // 删除的业务逻辑
        const {data: res} = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
        if (res.meta.status !== 200) return this.$message.error('删除该参数失败!')
        this.$message.success('删除该参数成功!')
        this.getParams()
      },
      // 文本框失去焦点或按下Enter 都会触发
      async handleInputConfirm(item) {
        if (item.inputValue.trim().length === 0) {
          item.inputValue = ''
          item.inputVisible = false
          return
        }
        // 如果没return，则证明输入了内容，需要做后续处理
        item.attr_vals.push(item.inputValue)
        item.inputValue = ''
        item.inputVisible = false
        // 要发起请求，保存这次操作
        this.saveAttrVales(item)
      },
      // 姜attr_vals 的操作，保存到数据库中
      async saveAttrVales(item) {
        // 保存到后台数据库
        const {data: res} = await this.$http.put(`categories/${this.cateId}/attributes/${item.attr_id}`, {
          attr_name: item.attr_name,
          attr_sel: item.attr_sel,
          attr_vals: item.attr_vals.join(',')
        })
        if (res.meta.status !== 200) return this.$message.error('修改参数项失败!')
        this.$message.success('修改参数项成功!')
      },
      // 点击按钮，显示文本框
      showInput(item) {
        item.inputVisible = true
        // 让文本自动获取焦点
        // $nextTick 作用：当页面上的元素被重新渲染之后，才会触发回调回函中的代码
        this.$nextTick(_ => {
          this.$refs.saveTagInput.$refs.input.focus();
        });
      },
      // 删除
      handleClose(index, item) {
        item.attr_vals.splice(index, 1)
        // 要发起请求，保存这次操作
        this.saveAttrVales(item)
      }
    },
    computed: {
      // 如果按钮需要被禁用，则返回true，否则返回false
      isBtnDisabled() {
        if (this.selectedCateKeys.length !== 3) {
          return true
        } else {
          return false
        }
      },
      // 当前选中的三级分类id
      cateId() {
        if (this.selectedCateKeys.length === 3) {
          return this.selectedCateKeys[2]
        }
        return null
      },
      // 动态计算标题的文本
      titleText() {
        if (this.activeName === 'many') {
          return '动态参数'
        } else {
          return '静态属性'
        }
      }
    }
  }
</script>

<style lang="less" scoped>
  .cat_opt {
    margin: 15px 0;
  }

  .el-cascader {
    margin-left: 20px;
    width: 20%;
  }

  .el-tag {
    margin: 10px;
  }

  .input-new-tag {
    width: 120px;
  }
</style>
